Here is a calculation which is false but we have to find where is the mistake take place......Plz tell me that mistake with a satisfied reason.... Let.... 2x= x + x 3x= x + x + x nx= x + x + x +..........+x (n.times) there fore xx= x + x + x +............+x (x.times) x2=x + x + x +........+ x diff w.r.t. x both side d(x2)/dx= d(x + x + x +........+ x)/dx 2x= 1+1+1+..........+1 2x=1*x bcoz it is x times in above 3 equations 2=1 plzzzzzzz sir tell me the mistake of this qus with reason,

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Differential Calculus> Find the mistake plzzzz...

Here is a calculation which is false but we have to find where is the mistake take place......Plz tell me that mistake with a satisfied reason....

Let....

2x= x + x

3x= x + x + x

nx= x + x + x +..........+x (n.times)

there fore

xx= x + x + x +............+x (x.times)

x²=x + x + x +........+ x

diff w.r.t. x both side

d(x²)/dx= d(x + x + x +........+ x)/dx

2x= 1+1+1+..........+1

2x=1*x bcoz it is x times in above 3 equations

2=1

plzzzzzzz sir tell me the mistake of this qus with reason,

Hasan Ali , 13 Years ago

Grade 12

3 Answers

Tushar Makkar

Last Activity: 13 Years ago

n was a no. multiplied with x but when x is multiplied by x this thing is different as x is a variable and not constant.

u r differentiating w.r.t x ....till 2x=1+1+...+1 is correct but u can not write 1+1+1+.....x times =x as x is variable not a constant( u can write 1+1+1+.... n times = n because n is not a constant)it is hypothetically correct but mathematically incorrect... by doing this a variable will be introduced from a constant thing means 1+1+1.... is constant but x is variable

pls. approve the ans. if u agree with my opinion